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Hydraulic disc brake set consisting of ST-R9170 shift and brake levers as well as BR-R9170 hydraulic Flat Mount disc brakes. Dura Ace Di2 Series.

Dura Ace Di2 ST-R9170 STI

The hydraulic Di2 ST-R9170 Dual Control levers feature a refined hood shape with svelte shared ergonomics for more rider control in race conditions, which is expanded by an optimally balanced hydraulic brake system. The ergonomically-enhanced Di2 shift levers produce a more defined shift click for a more intuitive feel and quicker shifting operation and expanded E-Tube customization allows every switch the option to independently turn on or off multi-shift. Thanks to the customisable function the levers fit any riding style and the carbon composite plastic hood material drops the weight of the whole construction. 

Dura Ace BR-R9170 Hydraulic Flat Mount Disc Brake Caliper

The all-new Dura-Ace hydraulic disc brake caliper was redesigned for the highest level of road performance. Utilizing a lightweight and minimalistic Flat Mount design, the R9170 caliper features stopping power ideally tuned for road applications. The new RT900 rotor offers even greater heat management capability than Shimano's SM-RT99 industry-leading Ice Technologies Freeza rotors, resulting in unparalleled braking performance and reliability in the most demanding conditions. 

Specifications

Material: Shifting lever: carbon

Body and brake lever: aluminum

Shifter lever body: glass fiber reinforced plastic (GFRP)

Weight: 615g (manufacturer's information)

Version: 2x11-speed

Bar diameter: 23.8 - 24.2mm
What's in the Box?

Shimano Dura-Ace Di2 ST-R9170 11 Speed Shifter - (Single)

Shimano BR-R9170 Flat Mount Brake Calipers - (Single)

Filled and bleed: left and right ST-9170 dual control lever hydraulic

SM-BH90 brake hoses (1000/1700mm)

L02A brake pads with cooling fins